Uniformly dyed red to green water swellable cellulosic fibers

ABSTRACT

Water swellable cellulosic fibers, for example, cotton, or blends or mixtures thereof with synthetic fibers, for example, polyester fibers, uniformly dyed to red to green shades with essentially water insoluble, non-vattable, 1,(4,5 or 8)-di(Nsubstituted)aminoanthraquinone dyes, for example, 1,4-bis(Nhexylamino)anthraquinone, said dyed fibers being fast to washing, drycleaning, crocking and in many instances, sublimation, and having a reflectance color value (S&#39;&#39;) after scour of at least about 2.

United States tent Blackwell 51 Apr.4,1l972 [54] UNIFORMLY DYEI) IRED TO GREEN WATER SWELLABLIE CELLULOSIC 21 Appl. No.: 879,900

{52] U.S. Cl. ..8/21 C, 8/39 [51] Int. Cl ..D06p 3/82, D06p 1/20 [58] Field of Search ..8/39, 21 C, 174, 173, 93, 94, 8/542 [56] References Cited UNITED STATES PATENTS 2,828,180 3/1958 Sertorio ..8/174 X 2,120,552 6/1938 Ellis et al. ..8/93 X FOREIGN PATENTS OR APPLICATIONS 1,071,074 6/1967 Great Britain ..8/21 C 1,112,279 5/1968 Great Britain ..8/21 C 988,046 3/1965 Great Britain ..8/26 1,056,358 1/1967 Great Britain ..PO/SL OTHER PUBLICATIONS W.A.S. White, Amer. Dyestuff Reporter, July 31, 1967, pages P59l- P597 TP890A512 Cocket et al., Dyeing of Cellulose Fibers & Related Processes, p. 291, Publ. by Academic Press, NYC (1961) TP893C6.

C. C' Wilcock et al., Whittaker s Dyeing With Coal-Tar Dyestuffs, 6th Ed. 1964, p. 244 TP914W6.

L. Peters et al., J. Soc. Dyers & Colourists, 73, 23 (1967) 8- 173 Lit. a

Primary ExaminerGeorge F. Lesmes Assistant E: aminerT. J. Herbert, Jr. Attorney-Louis H. Rombach [57] ABSTRACT 3 Claims, N0 Drawings UNIFORMLY DYED RED T O GREEN WATER SWELLABLE CELLULOSIC FIBERS BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to dyed water swellable cellulosic fibers and to dyed blends or mixtures of water swellable cellulosic fibers and synthetic fibers.

2. Description of the Prior Art 1 It is well known in the art that synthetic fibers, for example, fibers prepared from polyesters, polyamides or cellulose acetate, can be dyed with a wide variety of disperse dyes whose solubilities in water vary from very low to moderately high.

Natural fibers such as water swellable cellulosic fibers, espe- 1 cially cotton, are dyed by processes, and with dyes, which usually differ markedly from the processes and dyes employed with synthetic fibers. The conventional methods for dyeing the stained component. Even under optimum conditions, however, shade match on both components of the blend is difficult to achieve. The complexity of the two-stage process for dyeing blends also is apparent from a consideration of the divergency of operating conditions between conventional dyeing processes for cellulosic and for synthetic materials. In contrast to the aforesaid procedures for dyeing water swellable cellulose, the usual procedures for dyeing synthetic materials are based on dissolution of water insoluble dyes in the synthetic material.

Representative of prior art on the dyeing of blends of cellulosic and synthetic materials employing a two-stage process is U.S. Pat. No. 3,313,590. Analogous to the dyeing of such blends and confirming the aforesaid distinction between water 5 swellable cellulosic materials and nonswellable cellulose water swellable cellulosic materials may be summarized as follows:

1. A high molecular weight water insoluble dye is formed within the material, either by reacting two smaller components, as in the formation of an azoic dye by a coupling reaction, or by a chemical reaction which renders insoluble a soluble dye precursor, as in bat and mordant dyeing. A water soluble preformed dye having an affinity for the cellulosic material is exhausted onto the material from an aqueous solution by a procedure which involves reducing the solubility of the dye in the aqueous solution, as with direct dyes.

. A dye containing a substituent which reacts with the cellulose or a modified cellulose is exhausted onto the material from either an aqueous or non-aqueous solution under conditions such that the dye is chemically bonded to the substrate, as with fiber reactive dyes.

4. Water insoluble pigments are bonded to the cellulose with polymeric materials, as in pigment printing.

5. A finely divided form of a water insoluble dye is incorporated into the cellulose during a manufacturing step, as is sometimes done during spinning of viscose rayon.

None of these conventional procedures can be used to dye water swellable cellulose by directly introducing into the material a preformed, nonreactive, water insoluble dye since such dyes have little natural affinity for or substantivity to such cellulosic materials.

Representative of the aforesaid processes wherein dyes are formed in situ after a precursor is deposited on or within the cellulose are processes disclosed in U.S. Pat. Nos. 396,692 and 2,069,215 and British Pat. No. 1,071,074. A process employing water soluble preformed dyes for dyeing cellulose is discussed in the Journal of the Society of Dyers and Colourists, 73, 23 (1957).

The aforesaid processes suffer from a variety of disadvantages, such as complexity of application, inability to achieve a broad spectrum of colors, and low fastness of the dyed cellulose to aqueous washing and/or drycleaning with organic solvents.

The use of dyes of low water solubility for dyeing cotton is disclosed in British Pat. No. 1,112,279. The process involves the application of dye, water and urea or a structurally related compound to the substrate, followed by heating. In such a process dye utilization frequently is poor and undesirable basic degradation products from the urea or related compound may be formed.

Problems in addition to the above are encountered in the use of prior art dyes and dyeing processes for blends or mixtures of water swellable cellulosic and synthetic materials. Generally, complex two-stage processes are required and the components of the blend or mixture are dyed in separate steps with difierent dyes. Cross-staining may result and the amounts of dyes required usually are high, with each component undesirably interfering with the dyeing of the other. When crossstaining occurs, the dye must be capable of being scoured off acetate, U.S. Pat. No. 3,153,563 discloses a two-stage process wherein the cellulose acetate is dyed with a water insoluble dye without coloring the cellulose which then is dyed in an independent step.

The swelling of cotton fibers and other similar cellulosic materials by water has long been known.- Swelling usually is rapid upon contact with water, but it is facilitated by wetting agents and by heat. The swollen materials are enlarged, more flexible, reduced in strength, and otherwise modified in physical and mechanical properties. Because of their open structure, swollen cellulosic materials can be penetrated by and reacted with low molecular weight water soluble compounds. Valko and Limdi in the Textile Research Journal, 32, 331-337 (1962) report that cotton can be swollen with water contain ing both high boiling, water soluble, nonreactive compounds of limited molecular weight and a crosslinking agent. The water can be removed with retention of swelling and crosslinking can then be effected. The authors suggest that the technique may be useful not only for the introduction into cotton of water soluble reactive materials (crosslinking agents) but also other reactive materials which are insoluble inwater but soluble in said high boiling, water soluble, nonreactive compound. A similar technique is described in U.S. Pat. No. 2,339,913 issued Jan. 25, 1944 to I-Ianford and Holmes. The cellulosic is swollen with water, the water then is replaced with methanol-benzene and finally with benzene, with retention of swelling. A cellulose-reactive material (crosslinking agentlis added as a benzene solution and crosslinking is effected.

Blackwell, Gumprecht and Starn in commonly assigned U.S. application on Ser. No. 778,809, now abandoned in favor of continuation-impart application Serial No. 122,227, disclose a process for dyeing water swellable cellulosic materials with disperse dyes, which process comprises contacting a water swellable cellulosic material in any sequence with the following:

1. water in an amount sufficient to swell the cellulose;

2. a dye in an amount sufiicient to color the cellulose, a boiling saturated solution of which dye in 0.1 molar aqueous sodium carbonate exhibits an optical absorbance not in excess of about 30; and

3. a solvent in an amount sufficient to maintain swelling of the cellulose if water is removed, and which a. is at least 2.5 weight percent soluble in water at 25C., b. boils above about C. at atmospheric pressure,

0. is a solvent for the dye at some temperature in the range of about 0 to 225 C., and d. has the formula wherein n is 0 or 1; m is a positive whole number; R is H, C alkyl, C aralkyl or alkaryl,

wherein R2 is i-s alkyl, s-ro cycloalkyl, 145 aralkyl yL B' NH(phenyl), or NI-I(naphthyl), wherein R is as defined CH2C(CH2OR) CH2)2C(CH2OR)2, CHz)3CCH2 OR, (-CH2)4C, CH CHOR),,CH OR, CH (CHOR),, CH or -CI-I2(CHOR),, (CH) CH in which y is 2, 3, or 4 and z is 0, l, 2, 3, or 4 but no greater than y, and wherein R is as defined above; provided that at some stage during the process the interior of the swollen cellulose is contacted with a solution of the dye in aqueous solvent or solvent.

Particular embodiments of the aforesaid process include those wherein said solution is formed within and/or outside the swollen cellulose and those wherein solution of dye in aqueous dye solvent or dye solvent is achieved by means of heat, by reducing the proportion of water to dye solvent, or by adding an auxiliary solvent. Embodiments of the process also including dyeing at elevated temperatures.

Still other embodiments of the aforesaid process include the dyeing of blends or mixtures of cellulosic and synthetic materials, such as polyamide or polyester, with the same dye. In such a process the cellulose is dyed as described above and the synthetic material is dyed either at the same time or in an independent step of the proces.

Conventional vat and disperse dyes can be used in the Blackwell et al. process, but most such dyes are unsatisfactory in commercial operations. The vat dyes usually provide only surface staining because they lack sufficient solubility in the Blackwell et al. solvents and do not penetrate the fiber. Such surface stains can be largely removed by aqueous detergent or drycleaning scour. The conventional disperse dyes, on the other hand, although they may penetrate the fiber, are sufficiently soluble in hot alkali to be removed during'aqueous detergent scour.

OBJECTS AND SUMMARY OF THE INVENT ION It is an object of this invention to provide uniformly dyed fibers. A further object is to provide uniformly dyed water swellable cellulosic fibers and uniformly dyed blends or mixmany instances, sublimation, and having a reflectance color 75 naphthyl,

4 value (8) of at least about 2 after one thorough scour in aqueous detergent at 90-l00 C. and one thorough scour in perchloroethylene at 50 C., and wherein said fibers the dye comprises the non-vattable anthraquinone dye having the for mula Z O NH R wherein A is H, C] or Br;

one'ofX,YandZisNI- IRand boththe other two are H or OH; and R is selected from the group consisting of C alkyl, 0:-

decahydronaphthyl, cyclohexyl or cyclohexyl with 1-3 alkyl substituents having a total of one to eight carbon atoms, phenyl or phenyl with l-3 substitutents selected from F, Cl Br, CF,, N0 CN, R alkyl, alkoxy, OR N NR S-alkyl, SR,, SO N(alkyl) SO NR,'(alky|), SO alkyl, SO R Coalkyl,

COR,, CO alkyl, CO R NHCOalkyl, NHCOR,, with the proviso that the two ortho positions of the phenyl group shall not simultaneously contain substituents which have an electro-negativity as great as that of bromine, and wherein said phenyl substituents the alkyl and alkoxy moieties have one to eight carbon atoms, with a maximum of 12 carbon atoms derived from any plurality of such moieties, and R, is phenyl or phenyl with l-2 substituents selected from C alkyl, C alkoxy, N0, and Cl.

DETAILED DESCRIPTION OF THE INVENTION The above-defined essentially water insoluble, non-vattedable dyes which are used in the preparation of the dyed fibers of this invention are prepared by procedures well known in the art.

Many l,4-diaminoanthraquinones can be obtained by condensation (preferably under nitrogen) of the leuco (reduced) form of quinizarin (l,4-dihydroxyanthraquinone), or mixtures of quinizarine and leuco quinizarin, with 2 moles of an aromatic or aliphatic amine by heating in a suitable organic solvent (for example, chlorobenzene, Cellosolve, oxybis(2- ethylacetate), l-pentanol or an excess of the amine) in the presence of boric acid. The leuco form of the product is then oxidized by heating the reaction mixture in the presence of air and (preferably) with nitrobenzene. By using the leuco form of l,4,5,S-tetrahydroxyahthraquinone in place of leuco quinizarin in the procedure outlined above, equivalent 1,4- diamino-S,S-dihydroxyanthraquinones can be obtained.

Examples of amines that can be condensed with the leuco forms of quinizarin or l,4,5,8-tetrahydroxy-anthraquinone to produce useful dyes for application to fibers by the process described herein including the following:

TABLE 1 a-(5,6,7,8-tetrahydro)naphthyl, fi-

aniline 0-, mor p-toluidine 0-, m or p-ethylaniline 0-, mor p-anisidine 0-, mor p-phenetidine 2,3-xylidine 2,4-xylidine 2,5-xylidine 3 ,4-xylidine 3 ,S-xylidine 2,4-dirnethoxyaniline 2,5-dimethoxyaniline a-naphthylamine B-aminobenzie acid, n-octyl 3,5-dimethoxyaniline 3,4-diethoxyaniline Z-methoxy-S-methylaniline 3-isopropyl-4-anisidine p-butylaniline p-octylaniline p-butoxyaniline cyclohexylamine Z-aminodecalin l-amino 5,6,7,8-tetrahydronaphthalene noctyhmine n-dodeeyhmine 2,3-dichloronniline 3,4-diehloroaniline ester 4-n-octylcyclohexylamine o-thiophenetidine O-, mor p-fluoroaniline o-, mor p-chloroaniline o-, mor p-bromoaniline m-aminobenzotrifluoride 4-fluoroo-toluidine S-fluoroc-toluidine m-phenylsulfonylaniline m-phenoxyaniline 3,$-dichloroaniline 2,5-dichloroaniline 2-chloro 5-trifluoromethyl-aniline S-chloro-Imethylaniline 3-chloro2-methylaniline 3-chIoro-4methylaniline Z-chloro-S-methylaniline 2-chloro-5-methoxyaniline 3 -amino-4-methoxyphenyl 3-amino-4-methoxybenzenediethyl-amide sulfonic acid, diethylamide Diaminoand diaminodihydroxyanthraquinones can be prepared by condensing aromatic or aliphatic amines, such as those given in Table l, with the corresponding dichloroanthraquinone (or the equivalent bromo compound), by heating the reactants together in a suitable solvent such as oxybis(2-ethylacetate), nitrobenzene or an excess of the amine reactant. In certain cases, it is advantageous to have an inorganic acid acceptor present, such as potassium acetate and/or sodium carbonate. In other cases, copper powder and/or a cuprous salt may be a necessary addition to promote reaction. Dihalodihydroxyanthraquinone starting materials can also contain a third halogen atom, in the 2- or 3-position, which is not replaced during the condensation reaction. p- Phenylazoaniline and derivatives thereof can also be condensed with dihaloanthraquinones in the manner described.

An alternative route to diaminodihydroxyanthraquinones involves the condensation of amines with dihydroxydinitroanthraquinones by the action of heat.

Possible anthraquinone starting materials that can be reacted with the amines of Table l are given in Table 2.

TABLE 2 dyes are given in Table 3.

TABLE 3 bromobenzene p-bromocaprylophenone o-, mor p-bromoacetop-bromobenzoic acid, phenone p-tolyl ester o-, mor p bromobenzonitrile o-, mor p-bromobenzotrifluoride 0-, mor p-bromobiphenyl o-, m or p-bromochlorobenzene o-, mor p-bromofluorobenzene o-, m or p-bromonitrop-thiophenylbromobenzene 2,6-dimethyl-4-ter1.butyl- Z TP E R' ,H JQ p-bromobenzophenone p-phenoxybromobenzene 4-bromo-4'-t.butylbenzophenone m-bromophenyl methyl sulfone N .N-diethyl-p-bromobenzenesulfonumide benzene 3-bromo4-chlorobenzotrifluoride S-bromo-Z-chlorobenzm trifluoride I-bromo2,5-dichlorobenzene l-bromo-IiA-dichlorobenzene 2,4-dichloro-6-methylbromobenzene I-bromo-2,5-difluoroben- 2-chIoro-3,5-dimethylbromobenzene zene 2,4,6 -triethylbromobenzene p-bromothioanisole The cellulosic materials which can be dyed with the aforesaid dyes by the previously described Blackwell et al. process include all forms of cellulose which increase in size and in flexibility upon exposure to water. Suitable materials include natural fibers and purified wood pulps as well as reconstituted cellulose in fiber and film form. Cotton fibers can be dyed in any of the forms in which they are conventionally used in textile materials and after any of the treatments conventionally used to prepare them for dyeing. Also included is cotton which has been treated in any way which does not significantly reduce its swelling upon heating with water; raw or scoured cotton and cotton which has been mercerized or otherwise preshrunk are dyeable. Reconstituted cellulosic fibers which are sufficiently open in structure so that they are swollen by water and .penetrated by a dye solvent are dyeable, for example, cuprammonium rayon. Xanthate viscose rayon normally has a structure which is more difficult to swell and may require exposure to dye, water, and dye solvent for somewhat longer times at lower temperatures. To facilitate dyeing, such fabrics can be pretreated with 10 percent aqueous caustic or the dyeing can be carried out in the presence of wetting agents, preferably of the nonionic type. Mixtures of cotton and rayon tibers'can be dyed, and the dyes also can be used to dye purified wood pulp and paper. Excluded herein as the water swellable cellulosic material is'cellulose acetate which does not exhibit the requisite swellability in the presence of water. 7

The synthetic materials which can be dyed with the aforesaid dyes include polyesters, polyamides, cellulose ethers and esters, and copolymers and mixtures thereof with other components intended to make them more easily dyeable or to add other desirable properties. The dyes can be applied to synthetic materials by conventional procedures, such as the Therrnosol or aqueous dyeing procedures.

The dyes can be applied to water swellable cellulosic materials, or to blends or mixtures thereof with synthetic materials by the above-described Blackwell et al. process. The dyes are particularly useful for dyeing mixtures and blends of cotton and polyester or polyamide, such as mixtures containing 65 to percent polyethylene terephthalate and 20 to 35 percent cotton. In such mixtures, the synthetic material is dyed using conventional process conditions. Since the aforesaid dyes can be used to dye both components in a blend or mixture, scourability as a factor in dye selection need not be considered since the cross-staining problem (requiring scouring) often encountered in prior art processes employing two different types of dyes has been minimized.

The dyes used herein dye the substrate directly, that is, they do not require oxidation, reduction, hydrolysis, or any other chemical modification for development of color of fastness. The dyes exhibit excellent fastness to crocking, washing, drycleaning and many instances, sublimation.

In dyeing cellulosic materials using the Blackwell et al. process, water, dye, and dye solvent can be applied to the substrate in any sequence as long as water and dye solvent are simultaneously present at some stage which is either before or simultaneous with actual dyeing. The preferred method for dying fabrics composed of cellulosic fibers or mixtures of cellulosic and synthetic fibers is to impregnate the fabric with a mixture of one or more dyes, water, and dye solvent in a conventional dyed pad bath followed by squeezing to remove excess dye liquor, or to print with a solvent-containing printing paste, and subsequently heating to evaporate sufficient water to effect dissolution of the dye, at which time the fabric is dyed. Alternatively, water is evaporated, but in an insufficient amount to effect dissolution of the dye, after which pressure and heat are applied to effect dissolution without further evaporation of water. Dye pastes can be prepared by conventional techniques such as by milling the dye in the presence of a dispersing agent or surfactant. A dyebath can be prepared by diluting the dye paste with water or with aqueous solvent. Addition of a solvent to the dye paste before addition of water may cause dye separation and usually is avoided. It will be understood by those skilled in the art that additives other than a dye solvent and a dispersing agent can be present in dye baths.

Such additives frequently include migration inhibitors such as purified vegetable gums and wetting agents, examples of which are ionic and nonionic surfactants such as ethylene 2O oxide condensation products, hydrocarbon sulfonates and long-chain alcohol sulfates. Dye baths used in practicing this invention also can contain dyes other than those described above; for example, direct dyes or fiber reactive dyes for cotton or for polyamides can be present for shading purposes.

In the preferred dyeing procedure herein, an aqueous dye dispersion and the organic solvent are applied to the fabric from a single padbath. The amount of water in the padbath usually 70-95 weight percent and the solvent, 5-30 weight percent. The padded fabric is heated at 180-225 C. for 30-180 seconds. For cotton, temperatures as low as 150 C. usually are adequate. The dyed fabric generally is given an aqueous scour, or an aqueous scour followed by a perchloroethylene scour, to ensure complete removal of sur face dye.

As an quantitative measure of the shades obtainable on the fiber after scour, it is convenient to consider reflectance color value (8), as defined in British Pat. No. 1,056,358. The reflectance color value is given by the equation where L, M and N replace the well-known standard colorimetric values X, 1 and 2 set up by the CIE (Commission lntemationale dEclairage). Whereas X, Y, Z= JRxEMi, d). (where RA=reflectance characteristic of the wave length EA=radiation function of the illuminant and 5, g} and 5=CIE distribution coefiicients which characterize a particular color),

N=- fFxEM, g, 2 (where K =dyestuif concentration and (1R)\) 2 1-r (Rx-r where R)\ is defined above and r=residual surface refiectance of the substrate when dyed completely black).

The sum of (L+M+N), as the terms arc defined in equation where K, is as defined above.

A reflectance color value (5') of 2 represents a light but useful shade, that is, a dyeing rather than a mere staining of the fibers. It has been found that such shade depths are easily obtained on cotton with the dyes herein and, by increasing the concentration of dye in the padbath, shade depths of 10 times this figure can be achieved readily.

The dyes used in the present invention cannot be applied to cotton as vat dyes, In other words, they cannot be reduced toa water-soluble form, which has afi'inity for cotton from an aqueous solution, and then insolubilized the cotton fibers by an oxidation step.

The following examples illustrate typical preparative procedures for the dyes used herein. Parts are given by weight.

A reaction mixture containing 125 parts of chlorobenaene,

=22 parts of quinizarin, 1 1 parts of leuco quinizarin, parts of Ep-anisidine and 3.5 parts of boric acid was heated underv nitrogen with agitation at l 35-140 C. for 18 hours.

The nitrogen was turned off and 12 parts of nitrobenzene were added. The reaction mixture was then heated in air with agitation at 135 C. for'l hour and allowed to cool to 70 C. Eighty parts of isopropanol were added and the solids were isolated by filtration. The wet cake was washed with isopropanol, water and then again with isopropanol and dried; yield, 43 parts. Thin layer chromatography (benzene:acetonitrile 19:1 as eluent) on silica gel coated polyester film indicated the green product to be free of the violet-colored monocondensation product. A visible spectrum (in dimethyl-acetamidezwater 4: 1) showed the peaks at 420 .and 640 11., indicative of the structure for l,4-bis(p-methoxyanilino)-anthraquinone. A green shade isproduced when the dye is applied to cotton broadcloth by the methods described in Examples 10 and 1 l.

EXAMlLE 2 Condensation of p-Bromobenzophenone Diaminoanthraquinone A mixture of 24 parts of 1,4-diaminoanthraquinone, 55 parts of p-bromobenzophenone, 64 parts of sodium carbonate, 1.2 parts of cupric acetate, 1.5 parts of potassium acetate, 0.1 part of copper powder and 300 parts of triethyleneglycol diacetate was heated under nitrogen at 200-210 C. for 20 hours. The reaction mixture was allowed to cool to C. and 80 parts of isopropanol and 10 parts of water were added thereto. After cooling to room temperature with stirring, the solids were isolated by filtration, washed thoroughly with isopropanol and then with hot water until the filtrate was colorless. The solids were then reslurried in 500 parts of hot water, isolated by filtration, washed with isopropanol and dried. A visible spectrum of the chromatographically pure dye (in dimethylacetamidezwater 4:1) showed maxima at 425, 604 and 636 u,,indicative of the structure for l,4-bis-(p-benzoylanilino)anthraquinone. A bluishgreen shade is produced when the dye is applied to cotton by the methods described in Examples 10 and l 1.

EXAMPLE 3 with 1,4-

the reaction mass to cool to room temperature with stirring,

50 parts of ethanol were added and the solids were isolated by filtration. The wet cake was washed thoroughly with ethanol and then with water and dried. Thin layer chromatography (benzenezacetonitrile 19:1 as eluent) on silica gel coated polyester film indicated only one colored (violet) component. A visible spectrum (in dimethylacetamidezwater 4:1) indicated an absorption peak at 546 t,- indicative of the structure for l,5-bis(p-methylahmho)anthraquinone. A violet shade is produced on cotton when the dye is applied by the methods described in Examples 10 and l 1.

EXAMPLE 4 one p-n-Butylaniline was condensed with 1,8-dichloroanthraquinone by essentially the same method as described in Example 3. The resulting chromatographically pure dye was l,8-bis(p-n butylanilino)anthraquinone. A violet shade, noticeably more blue than that obtained in Example 3, is produced on cotton when the dye is applied by the methods of Examples 10 and 11.

EXAMPLE 5 Condensation of Z-Aminodecalin with Leucoquinizarin A mixture of 24 parts of leucoquinizarin, 60 parts of 2- aminodecalin, 8 parts of boric acid and 250 parts of Cellosolve was heated to the reflux temperature for 12 hours. The reaction mass was poured into 750 parts of a mixture of water, methanol and N-hydrochloric acid in a 1021011 ratio by volume. The slurry was stirred for 1 hour and the solids were isolated by filtration. The product was washed with the water/methanol/hydrochloric acid mixture and then with water and dried. After recrystallization from pyridine, the blue dye, 1,4-bis (N-B-decahydronaphthylamino)anthraquinone, was chromatographically pure. Cotton is dyed in level blue shades with this product when applied by the procedures of Examples 10 and 11.

EXAMPLE 6 Condensation of p-Toluidine with 1,5-dichloroanthrarufin A mixture of 9.27 parts of 1,5-dichloroanthrarufin and 39 parts of p-toluidine was heated under nitrogen with stirring at 180 C. for 6% hours. After cooling externally to 80 C., 65 parts of isopropanol were added with stirring. The product was isolated by filtration and washed with isopropanol. The wet cake was reslurried in 100 parts of hot (70 C.) 1 N- hydrochloric acid and collected by filtration. The wet cake was washed thoroughly with water, then with isopropanol, and dried. The product was shown by thin layer chromatography (silica gel coated polyester film, eluted with benzenezacetonitrile 19:1) to contain only one colored (blue) component. The dye has an absorption-maximum at 680 a, indicative of the structure for l,5-bis)p-methylanilino)- 4,8-dihydroxyanthraquinone.

EXAMPLE 7 Condensation of p-Toluidine with 1,8-Dichlorochrysazin A mixture of 9.27 parts of 1,8-dichlorochrysazin, 4.92 parts of anhydrous sodium acetate, 6.36 parts of sodium carbonate, 39 parts of p-toluidine and 0.06 part of copper bronze was stirred under nitrogen at 180-190 C. for 3 hours. After cooling to 100 C., 60 parts of methyl ethyl ketone were added with stirring. The reaction mass was cooled to room temperature and the product was collected by filtration. The wet cake was washed well with water and slurried in 30 parts of methyl ethyl ketone at about 70 C. The product was isolated by filtration of the hot slurry. Thin layer chromatography indicated one colored (blue) component in the solids. The dye has an absorption maximum at 683 u, indicative of the structure for 1,8-dihydroxy-4,5-bis(p-methylanilino)anthraquinone. Cotton is dyed in uniform blue shades (that are marginally greener than those obtained with the dye of Example 6) by the procedures illustrated in Examples 10 and l 1.

EXAMPLE 8 1,5-Dihydroxy-4,8-

Condensation of p-Butylaniline with 1,8-Dichloroanthraquinat 180 C. under nitrogen for 2 hours. After the reaction mixture had been cooled externally to 80 C., 3,600 parts of hot (75 C.) isopropanol were added and the mixture was allowed to cool with stirring overnight. The product was isolated by filtration and washed with isopropanol. The wet cake was reslurried in 500 parts of 1 N-hydrochloric acid at 70 C. and the solids were collected by filtration, washed with water and then isopropanol, and dried. The blue dye was chromatographically pure and showed an absorption maximum'at 680 u. lts structureis identical to that of the dye of Example 6.

EXAMPLE 9 Condensation of p-Bromotoluene with 4,8-Diaminoanthrarufin A mixture of 17.5 parts of 1,5-diaminoanthrarufm, 34 parts of p-bromotoluene, 28 parts of nitrobenzene, 12.5 parts of sodium carbonate, 0.8 part of cuprous chloride and 2.8 parts of potassium acetate was stirred 'at 185 C. under nitrogen for about 20 hours. The reaction mass was cooled to 100 C. and 5 5 parts of methyl ethyl ketone were added. The reaction mixture was then allowed to cool to room temperature. The solids were isolated by filtration, washed with methyl ethyl ketone and then with hot water and dried. A chromatographically pure blue solid was obtained which showed an absorption maximum at 680 my. It is identical in structure to the dye of Example 6.

The following examples illustrate the manner in which the dyes described herein can be used to dye or print cellulosics and cellulosic-polyester blends.

EXAMPLE l0 Dyeing of 65/35 Dacron Polyester/Cotton Blend Fabric a. A padbath was prepared containing water to 1 liter A continuous length of 65/35 Dacron polyester/cotton fabric was padded at 60 percent uptake, based on the weight of the fiber, and the padded fabric was passed at a rate of 2 yards per minute between two 1,000 watt infrared lamps (Fostoria-Fannon, Inc., Infrared Heater Model 6624), with each lamp shining on opposite surfaces of the fabric from a distance of about 3 inches. The continuously moving fabric was passed through a circulating air oven at -100 C., with a hold-up time of one minute, and then through an oven at 200-210 C. with a hold-up time of 1.7 minutes. The hot dry fabric was cooled to room temperature and rinsed for 1 minute each in sequence in water at 20-30 C., in water at -95 C., at 90-95 C. in water containing 1 percent of an ether-alcohol sulfate detergent, in water at 90-95 C., and in water at 20-30 C. After drying the fabric, it was scoured in perchloroethylene at 50 C. for 5 minutes and dried. The fabric was uniformly colored in a satisfactory union dyeing of the cotton and Dacron fibers.

b. Experiment (a) was repeated except that the following heating procedure was employed. The padded fabric was passed at a rate of 2 yards per minute between banks of infrared lamps, with one 1,000 watt lamp (Fostoria-Fannon, lnc., Infrared Heater Model 6624) shining on each surface perpendicular to the fabric from a distance of about 3 inches. The moist fabric was then passed over a series of four revolving smooth-surfaced drums increasing stepwise in temperature from C. to about C. The average contact time on each drum was about 18 seconds. Next, the fabric moved continuously into an oven held at about 210 C., where the total contact time was about 90 seconds.

The above procedures were used for 100 percent mercerized cotton broadcloth, except that the padbath contained 150 grams per liter of methoxypolyethylene glycol (MW. 350) and the curing temperature was reduced to 180 C. Using the procedure of Example 10(a), modified as described with respect to solvent concentration and curing temperature,

a sample of cotton broadcloth was dyed a deep, uniform green shade. After the material had been scoured in aqueous detergent and then in perchloroethylene at 50 C. for minutes as described above, the dyed cloth had a reflectance color value of 10.75.

When the dye of Example 1 was replaced with an equivalent amount of the blue dye of Example 6 and a sample of cotton broadcloth was dyed therewith and scoured in the same manner, the uniformly dyed cloth was found to have a reflectance color value of 9.24.

EXAMPLE 11 Printing of Percent Cotton Fabric A cotton fabric was padded to about 70 percent pickup with an aqueous solution containing 200 .grams per liter of polyethylene glycol (M.W. 600). The padded fabric was heated at 160 C. for 5 minutes to evaporate water. The fabric was then printed in a pattern with a print paste prepared from:

violet paste (I566 active ingredient) of Example 3 10 grams purified natural gum ether thickener 60 grams water 30 grams The printed fabric was heated at 180 C. for 100 seconds, scoured in water containing an ether-alcohol sulfate detergent at about 90 C. for 5 minutes, dried, scoured in tetrachloroethylene at about 50 C. for 5 minutes and dried. The printed areas were strongly dyed.

A procedure similar to that in Example 1 l was used to print polyester-cotton blends but the heating temperature was raised to about 200 C. The fastness results of such prints are comparable to those of fabric which is dyed with the same dyes by the procedure of Example 10.

Other examples of water-insoluble dyes that produce deep shades on cotton by the processes described above are depicted in Tables 4-9.

TABLE 4 Red to Green Dyes 0 NH-R l l violet m-phenoxyphenyl bluish violet violet green phenyl blue reddish reddish violet violet m-cyclohexylcarboxblue violet violet amidophenyl m-(N,N-diethylcarblue reddish violet bamoyllphenyl violet p-(N,N-di-n-butylgreen reddish violet sulfamoyDphenyl violet p-n-butoxyphenyl green violet violet p-n-hexyloxyphenyl green violet violet 2-methyl-5-chloroblue violet violet phenyl m-(N,N-diethylsulblue reddish reddish famoyhphenyl violet violet o-trifluoromethylblue reddish reddish phenyl violet violet Z-methoxy-S-ethylgreen reddish reddish sulfonylphenyl violet violet Z-chloro-S-trifluorm blue reddish reddish methylphenyl violet violet m-methylsulfonylblue reddish reddish phenyl violet violet p-(N-methylanilinogreen violet violet sulfonyl)phenyl m-phenylsulfonylblue reddish reddish phenyl violet violet p-n-octylphenyl blue reddish reddish violet violet 3-isopropyl-4-methgreen violet violet oxyphenyl Z-methoxy-S-methylgreen violet violet phenyl o ethoxyphenyl green violet violet 2,4-dimethoxyphenyl green violet violet 2,5-dimethoxyphenyl green violet violet o-ethylthiophenyl blue violet violet m-trifluoromethylblue reddish reddish phenyl violet violet m-flurophenyl blue reddish reddish violet violet P-fluorophenyl bluish reddish reddish green violet violet p-acetamidophenyl blue violet violet p-benzamidophenyl blue violet violet 2,5-dichlorophenyl blue reddish reddish violet violet 2-methyl-3-ehloroblue reddish violet phenyl violet p-nitrophenyl green rubine maroon m-nitrophenyl green-blue rubine maroon p-(p-t-butylbenzoyl)- green reddish reddish phenyl violet violet m-methylthiophenyl green-blue reddish violet violet o(5,6,7,8-tetrahygreen violet violet dro)-napthyl 2,6-dimethylphenyl blue reddish violet violet o-ethylphenyl green-blue violet violet 2,4,6-trimethylphenyl blue reddish violet 2,3,5,6 -tetramethylblue reddish phenyl violet 2,4,6-triethylphenyl blue reddish violet 2,6-dimelhyl-4-tblue reddish butylphenyl violet eyclohexyl blue red bluish red p-n-octycyclohexyl blue red bluish red ,B-decahydronaphthyl blue red bluish red 2,6-dimethylcycloblue red bluish hexyl red n-decyl blue red red TABLE 5 Blue Dyes H lO 0 IIIH-R l l RNH OH pm-hexylphenyl m-bromophenyl p-biphenylyl 2,$-dimethylcyclohexyl p-chlorophenyl 2,5dimethylphenyl mlrifluoromelhylphcnyl p-ethoxyphenyl m-tolyl 2,5dichlorophenyl o-n-butoxyphenyl n-decyl p-valeramidophenyl 2,4,6-triethylphenyl 2-chloro-5-methylphenyl ZA-dimethoxyphenyl Z-methoxy-S-methylphenyl m-n-hexylcxycarbonylphenyl 3-isopropyl4-melhoxyphenyl TABLE 6 Blue Dyes RNH O N HR I II I J H OH o-methoxyphenyl 2-methyl-3-chlorophenyl m-chlorophenyl 3,4-dichlorophenyl 3O p-n-burylphenyl p-fluorophenyl 2-chloro-5-methoxyphenyl m-cyanophenyl 2,5'dimethoxy-phenyl p-benzoylphenyl 2.4-dimethylphenyl 2,-dimethyM-chlorophenyl P-(P'- yl)biphcnylyl p-(N,N-di-n-butylsulfamoyl) phenyl 3 5 3,4-dielhoxyphenyl TABLE 7 Blue Dyes H O O I |IH-R R-NII II p-tolyl m-chlorophenyl o-ethoxyphenyl Z-methoxy-S-methylphenyl n-octyl TABLE 8 Blue Dyes R-NH fl) IIIH-R H O (i p-tolyl 2,5-dimelhoxyphenyl p-chloro-S -methylphenyl cyclohexyl TABLE 9 Green Dyes HO O NH-R III! The embodiments of the invention in which an exclusive property orprivilege is claimed are defined as follows:

1. Red to green, uniformly dyed, water swellable cellulose fibers or water swellable cellulose fibers blended with synthetic fibers, said fibers being fast to washing, drycleaning and crocking and having a reflectance color value S) of at least about 2 after one thorough scour in aqueous detergent at aufi-utq i aaadot eih mu lss luinygr hylias at 50 C., wherein said fibers the dye comprises the non-vattable anthraquinone dye having the formula wherein A is H, C1 or Br;

one of X, Y and Z is NHR and both the other two are H or 0H; and

R is selected from the group consisting of C alkyl, (1- naphthyl, a-(5,6,7,8-tetrahydro)naphthyl, [3- decahydronaphthyl, cyclohexyl or cyclohexyl with l3 alkyl substituents having a total of one to eight carbon atoms, phenyl or phenyl with 1-3 substituents selected from F, Cl, Br, CF N0 CN, R alkyl, alkoxy, OR N NR S-alkyl, SR SO N(alkyl) SO NR,(alkyl), a]- kyl, SO R COalkyl, COR,, CO alky1, CO R Nl-lCOalkyl, NHCOR with the proviso that the two ortho positions of the phenyl group shall not simultaneously contain substituents which have an electro-negativity as great as that of bromine, and wherein said phenyl substituents the alkyl and alkoxy moieties have one to eight carbon atoms, with a maximum of 12 carbon atoms derived from any plurality of such moieties, and R, is phenyl or phenyl with 1-2 substituents selected from C alkyl, C alkoxy, NO 2 and C1. 2. The fibers of claim 1, the fibers being cotton. 3. The fibers of claim 1, the fibers being a blend or mixture of cotton and polyester fibers. 

2. The fibers of claim 1, the fibers being cotton.
 3. The fibers of claim 1, the fibers being a blend or mixture of cotton and polyester fibers. 